Image processing apparatus

An image processing apparatus comprising:

• a block output unit that reads an input block descriptor indicating a position and a size of a block image from a predetermined memory, and extracts and outputs the block image as part of a page image based on the input block descriptor;
• an arithmetic processing circuit that executes predetermined image processing on the block image;
• a data reading circuit that reads an output block descriptor indicating the position and the size of the block image from the predetermined memory, reads the block image after the predetermined image processing from the arithmetic processing circuit based on the output block descriptor, and outputs the block image after the predetermined image processing;
• and
• a block descriptor generation unit that generates the input block descriptor and the output block descriptor and stores the input block descriptor generated and the output block descriptor generated in the predetermined memory,
• wherein the arithmetic processing circuit executes the predetermined image processing on block images for one band in accordance with an input band request,
• wherein the data reading circuit outputs the block images for one band in accordance with an output band request, and
• wherein the block descriptor generation unit stores input block descriptors and output block descriptors for at least one band in the predetermined memory in line with timing of the input band request or the output band request.